We have the ability as a community to add custom off-topic close reasons.
We actually have one existing one, but it hasn't been used in ages (at least as far as I've seen). This is its wording:
This question may invite speculative answers, as the question is not fully defined. The validity of some answers may be based upon opinion. Good questions for this site have a limited number of objectively correct answers.
In reflection, this close reason may not have been as clear or useful as it once seemed. "Too broad" seems to have covered many of the cases where we might otherwise want to use this.
Is there a use-case for this close reason as-is that I'm not seeing, should we just dump it entirely, or should it be changed to be more clear?